body{
    /* 没有. */
    background: url('../Imgs/stardewbackground.png') no-repeat;
}

/* 头部开始 */
/* 大盒子 */
.header{
position: sticky;
width: 100%;
height: 84px;
background-color: brown;

}
/* 小盒子 */
.inner{
    width: 1300px;
    height: 84px;
    margin: 0 auto;
}
.inner img.logo{
    float: left;
    top: 15px;
    left: 0;
}

.ulinner{
    width: 890px;
    margin: 0 auto;
    display: block;
}

.ulinner li{
    float: left;
    padding: 20px 0 0 0;
    width: 115px;
    height: 64px;
    text-align: center;
    font-size: 18px;
    color: aliceblue;
    cursor: pointer;
}

.ulinner:hover li{
    color: aliceblue;
}

.logininner{
    width: 182px;
    height: 45px;
    float: right;
    right: 0;
    top: 0;
    padding: 21px;
}

.subnav {
    width: 100%;
    height: 0;
    background-color: blueviolet;
    transition: all .3s ease;
}

.header:hover .subnav {
    height: 280px;
}

.subnav ul.subUlIn{
    display: block;
    width: 990px;
    height: 280px;
    margin: 0 auto;
}

.subnav ul.subUlIn li{
    width: 110px;
    float: left;
    margin: 0 10px 0 0;
    overflow: hidden;
    line-height: 30px;
}

.subnav ul.subUlIn li a{
    color: aquamarine;
    display: block;
}